what is the most efficient wakeup method (signals,msgs,semaphores) ?

2000-10-19 Thread Benno Senoner
Hi, I'd like to hear your opinions on the efficiency for the IPC mechanism betweeen two processes. (from a kernel point of view) I have a process (A) which wakes up another process (B) very often (200-1000 times/sec). eg: A) while(1) { wait_a_few_msecs_using_RTC(); wake_up_B(); } B) while(1)

what is the most efficient wakeup method (signals,msgs,semaphores) ?

2000-10-19 Thread Benno Senoner
Hi, I'd like to hear your opinions on the efficiency for the IPC mechanism betweeen two processes. (from a kernel point of view) I have a process (A) which wakes up another process (B) very often (200-1000 times/sec). eg: A) while(1) { wait_a_few_msecs_using_RTC(); wake_up_B(); } B) while(1)

[linux-audio-dev] Ingo's lowlatency-test7-A0 excellent latencies (<1msec), but kernel filesync problems ...

2000-09-12 Thread Benno Senoner
Hi folks, I benchmarked Ingo's lowlatency-2.4.0-test7-A0 kernel (http://people.redhat.com/mingo/lowlatency-patches/lowlatency-2.4.0-test7-A0) I can only say that it looks VERY promising ( < 1msec latencies !) But there seems to be problems with the kernel disk sync code: After the disk stress

[linux-audio-dev] Ingo's lowlatency-test7-A0 excellent latencies (1msec), but kernel filesync problems ...

2000-09-12 Thread Benno Senoner
Hi folks, I benchmarked Ingo's lowlatency-2.4.0-test7-A0 kernel (http://people.redhat.com/mingo/lowlatency-patches/lowlatency-2.4.0-test7-A0) I can only say that it looks VERY promising ( 1msec latencies !) But there seems to be problems with the kernel disk sync code: After the disk stress

Montavista's preemptive & preempt-rtsched kernels benchmarked ( still 50msec latencies )

2000-09-10 Thread Benno Senoner
Hi, I benchmarked Montavista's premptive and preemtive-rtsched kernels ( patches for 2.4.0-test6) using "latencytest". summary: both patches do not improve latencies very much over standard kernels I believe around factor 2, but far away from the factor 10 ( 12msec) claimed in the

Montavista's preemptive preempt-rtsched kernels benchmarked ( still 50msec latencies )

2000-09-10 Thread Benno Senoner
Hi, I benchmarked Montavista's premptive and preemtive-rtsched kernels ( patches for 2.4.0-test6) using "latencytest". summary: both patches do not improve latencies very much over standard kernels I believe around factor 2, but far away from the factor 10 ( 12msec) claimed in the